Honestly Mitt has said worse...
"no one has asked to see my birth certificate"

"All right, there are 47 percent who are with him, who are dependent upon government, who believe that they are victims, who believe the government has a responsibility to care for them, who believe that they are entitled to health care, to food, to housing, to you name it."

"I'm running for office, for Pete's sake, I can't have illegals."

"So, Mr. President, take your campaign of division and anger and hate back to Chicago."

"had [my father] been born of Mexican parents, I'd have a better shot of winning this."

Now that you mention it there's nothing remotely racist in his tone, words, or anything else. I'll keep giving him the benefit of the doubt until he walks up to me & spits in my face.